Vector Algebra | Scalar and Vector Product

For any three vectors a, b and c (a – b) . (b + c) × (c + a) is equal to

ক

2a.(b × c)

খ

[a b c]

For what value of λ are the vectors 2î + λĵ +5k̂ and -î + ĵ + k̂ mutually perpendicular?

ক

- 1

খ

2

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